I saw an interview with Robert Barnes recently - he is a lawyer and a semi-insider of the Trump camp (chummy with Don Jr).

He claims Big Mike is never coming back to politics as she hates it and hates being around people. Her goal (and the deal she made with Barack) is they are now finished with politics and now is the time to cash-in.

She wants to farm all the juicy relationships and deals her and Barack made while in office.